EP1020026B1 - Appareil et procede d'amplification d'un signal - Google Patents

Appareil et procede d'amplification d'un signal Download PDF

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Publication number
EP1020026B1
EP1020026B1 EP98921105A EP98921105A EP1020026B1 EP 1020026 B1 EP1020026 B1 EP 1020026B1 EP 98921105 A EP98921105 A EP 98921105A EP 98921105 A EP98921105 A EP 98921105A EP 1020026 B1 EP1020026 B1 EP 1020026B1
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EP
European Patent Office
Prior art keywords
doherty
output
amplifier
signal
input
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EP98921105A
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German (de)
English (en)
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EP1020026A1 (fr
EP1020026A4 (fr
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James Frank Long
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Motorola Solutions Inc
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Motorola Inc
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
    • H03G3/3042—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers in modulators, frequency-changers, transmitters or power amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
    • H03F1/0211—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the supply voltage or current
    • H03F1/0216—Continuous control
    • H03F1/0233—Continuous control by using a signal derived from the output signal, e.g. bootstrapping the voltage supply
    • H03F1/0238—Continuous control by using a signal derived from the output signal, e.g. bootstrapping the voltage supply using supply converters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
    • H03F1/0277—Selecting one or more amplifiers from a plurality of amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
    • H03F1/0288—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers using a main and one or several auxiliary peaking amplifiers whereby the load is connected to the main amplifier using an impedance inverter, e.g. Doherty amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G2201/00—Indexing scheme relating to subclass H03G
    • H03G2201/10—Gain control characterised by the type of controlled element
    • H03G2201/106—Gain control characterised by the type of controlled element being attenuating element

Definitions

  • the present invention relates generally to amplifiers, and, more particularly to an apparatus and method for amplifying a circuit.
  • Doherty amplifiers High efficiency linear amplifiers such as Doherty amplifiers are well known to those skilled in the art. However, it is also well known that Doherty amplifiers typically have relatively poor linearity. In addition, their linearity is typically inversely proportional to their efficiency. As a result, although Doherty amplifiers can improve the performance of high peak-to-average ratio linear amplifiers, they may only do so over a narrow dynamic range.
  • RF radio frequency
  • Doherty type amplifier circuits would become more attractive if their efficiency were raised at low output power levels.
  • the RF input signal applied to the multicarrier power amplifier may vary by as much as 30 dB.
  • Amplifier circuits for extending the dynamic range of an amplifier and having increased efficiency are e.g. known from US-A-5 101 172 or US-A-5 179 353.
  • an amplifier circuit including an amplifier having an input and an output, a first Doherty amplifier having an input coupled to the output of the amplifier, an output and a control input.
  • the amplifier circuit also includes a detector having a detector input coupled to detect a first Doherty output signal from the output of the first Doherty amplifier, and an output. The output is coupled to an input of a controller, the controller having a first and second controller output.
  • the amplifier circuit further includes a switching regulator having an input coupled to the first controller output, and an output coupled to the control input of the first Doherty amplifier.
  • the amplifier circuit includes a variable attenuator having a signal input, an output coupled to the input of the amplifier, and a control input coupled to the second controller output.
  • a method for amplifying a signal including receiving an input signal at an input of a variable attenuator, attenuating the input signal to form an attenuated signal, and amplifying the attenuated signal to form an amplified signal.
  • the method also includes amplifying the amplified signal in a Doherty amplifier, generating a Doherty output signal in response to receiving a supply voltage provided by a switching regulator at a control input to the Doherty amplifier.
  • the method includes detecting a total signal in a detector, forming a detected output signal, the total signal including at least the first Doherty output signal, comparing the detected output signal to a predetermined controller threshold in a controller, and generating a first and a second control signal in the controller if the detected output signal falls below the predetermined controller threshold.
  • the first control signal generating a switching regulator output voltage in a switching regulator and then modifying a voltage of the first Doherty amplifier based upon the switching regulator output voltage.
  • the second control signal modifying a voltage of the variable attenuator.
  • an amplifier circuit including a first Doherty amplifier having an input, a first Doherty control input, and an output, the output coupled to the input of a second Doherty amplifier having a second Doherty control input and an output.
  • the amplifier circuit also includes a detector having a detector input coupled to detect a second Doherty output signal from the output of the second Doherty amplifier, and an output.
  • the output is coupled to an input of a controller, the controller having a controller output.
  • the amplifier circuit further includes a switching regulator having an input coupled to the controller output, and a first and second switching regulator output, the first switching regulator output coupled to the first Doherty control input and the second switching regulator output coupled to the second Doherty control input.
  • a method for amplifying a signal including receiving the input signal at an input of a first Doherty amplifier, receiving a first supply voltage at a first Doherty control input of the first Doherty amplifier, amplifying the input signal in the first Doherty amplifier, forming a first Doherty output signal, receiving the first Doherty output signal at an input of a second Doherty amplifier, receiving a second supply voltage at a second Doherty control input of the second Doherty amplifier, and amplifying the first Doherty output signal in the second Doherty amplifier, forming a second Doherty output signal.
  • the method further includes detecting a total signal, forming a detected output signal, the total signal including at least the second Doherty output signal, and then comparing the detected output signal to a predetermined controller threshold in a controller.
  • the method includes generating a control signal in the controller if said detected output signal falls below the predetermined controller threshold, generating a first supply voltage in a switching regulatorbased upon the control signal and subsequently modifying a voltage of the first Doherty amplifier based upon the first supply voltage.
  • generating a second supply voltage in the switching regulator based upon the control signal and subsequently modifying a voltage of the second Doherty amplifier based upon said second supply voltage.
  • FIG. 1 depicts a typical Doherty amplifier.
  • a Doherty amplifier 208 receives an input signal 206 and generates a Doherty output signal 220, in response to receiving a control input 234.
  • the control input generally represents a voltage. commonly referred to as the drain voltage and may be annotated as V dd .
  • Doherty amplifiers utilizing field effect transistors typically operate with a fixed drain voltage.
  • Doherty output signal 220 When Doherty output signal 220 is at saturated power, Doherty amplifier 208 operates at maximum drain efficiency. In other words, Doherty amplifier 208 operates at maximum efficiency when the voltage of Doherty output signal 220 is equal to the drain voltage V dd . Saturation occurs at 0dB backoff as shown in FIG. 2.
  • Doherty efficiency which is defined as the ratio of RF power output to the DC input power, drops slightly with increasing backoff from saturation until a transition voltage is reached at 6dB from saturation At a 6dB backoff from saturation, maximum Doherty efficiency is again reached.
  • Doherty efficiency falls off rapidly with increasing backoff from saturation.
  • the efficiency of Doherty amplifier 208 is reduced proportionally to the output signal voltage amplitude. Therefore, when Doherty output signal 220 is low, Doherty efficiency is low. Conversely, when Doherty output signal 220 is high, Doherty efficiency is high. For example, a Doherty output signal power of 20 watts is approximately 40% efficiency for a fixed drain voltage of 20 volts, while , a Doherty output signal power of 60 watts is approximately 57% efficiency for a fixed drain voltage of 20 volts.
  • Doherty efficiency decreases. For example, at 6dB backoff from saturation, in a 900 Mhz application, Doherty efficiency is approximately 46% for a fixed drain voltage of 20 volts and drops to approximately 40% for a fixed drain voltage of 30 volts.
  • Doherty amplifier 208 There are two practical problems with operating a Doherty amplifier 208 at a low fixed drain voltage.
  • One problem is an increase in intermodulation, also known as distortion, of Doherty output signal 220. This distortion may be mitigated by keeping the power of Doherty output signal 220 at a low value, for example, 9 to 10 dB below saturation.
  • the other problem is a reduction in Doherty amplifier 208 power gain.
  • the Doherty amplifier 208 power gain reduction may be accommodated by adding a variable attenuator together with a fixed gain provided by a driver amplifier.
  • the variable attenuator and fixed gain driver amplifier are configured to offset a gain loss across Doherty amplifier 208.
  • the supply voltage presented at control input 234 is adjusted in proportion to a voltage of Doherty output signal 220.
  • the adjustable supply voltage presented at control input 234 replaces the aforementioned fixed supply (or drain) voltage, V dd .
  • FIG. 3 depicts a block diagram of an amplifier circuit 200 for amplifying a signal which results in an increase of Doherty amplifier efficiency according to a preferred embodiment of the present invention.
  • Amplifier circuit 200 is configured with an input 201 and an output 240.
  • Amplifier circuit 200 includes a variable attenuator 202, an amplifier 204, a first Doherty amplifier 208, a detector 224, a controller 228, and a switching regulator 232.
  • An input signal 250 e.g. a multicarrier 900 megahertz (Mhz) RF signal which may be generated by a plurality of RF transceivers
  • Mhz multicarrier 900 megahertz
  • an amplifier 204 preferably a driver amplifier, has an input for receiving an attenuated signal generated by variable attenuator 202, and provides an input signal 206 to first Doherty amplifier 208.
  • First Doherty amplifier 208 receives input signal 206 and generates a first Doherty output signal 220, in response to receiving a supply voltage provided by switching regulator 232 at control input 234.
  • detector 224 preferably a diode detector, is coupled to the output of first Doherty amplifier 208 by means of a directional coupler (not shown). Detector 224 samples and rectifies the first Doherty output signal, and provides a detected output signal 226 to controller 228.
  • Detected output signal 226 is a direct current (DC) voltage proportional to the signal detected at a detector input 222.
  • DC direct current
  • controller 228 If detected output signal 226 falls below a predetermined controller threshold, for example a threshold voltage, controller 228 will generate a first and second control signal. Accordingly, controller 228 converts detected output signal 226 into a first control signal 230 suitable for input to switching regulator 232. The conversion is such that switching regulator 232 will decrease the supply voltage provided as control input 234 to first Doherty amplifier 208, in response to a decrease in the detected output signal. As a result, the voltage gain (first gain) across first Doherty amplifier 208 decreases.
  • a predetermined controller threshold for example a threshold voltage
  • controller 228 converts detected output signal 226 into a second control signal 231 suitable for input to variable attenuator 202.
  • the conversion is such that the variable attenuator will decrease the attenuation of input signal 250, consequently increasing the signal appearing at the input of first Doherty amplifier 208.
  • voltage gain (second gain) across the sum of variable attenuator 202 and driver amplifier 204 increases.
  • the sum of the first and second gain remains substantially constant across amplifier circuit 200.
  • Amplifier 204 and Doherty amplifier 208 are preferably metal oxide semiconductor field effect transistor (MOSFET) amplifiers, such as the MRF 183 Series amplifiers available from Motorola, Inc.
  • Variable attentuator 202 is preferably an AT-108 voltage variable absorptive attenuator made by M/A-COM, Inc.
  • Detector 224 may be a MA4E932A Zero Bias Detector diode, also made by M/A-COM, Inc.
  • Switching regulator 232 may be any number of types of switching regulators similar to the AT&T version FE150R DC-DC Power Module.
  • Controller 228 may be implemented by either software or hardware methods. For example, controller 228 may be realized as a hard coded look-up table or as an analog circuit including level shifting and scaling operational amplifiers.
  • a second Doherty amplifier 310 may be added in a parallel arrangement with Doherty amplifier 208 such that second Doherty amplifier 310 has an input coupled to the input of Doherty amplifier 208 and an output coupled the output of Doherty amplifier 208, as illustrated. Second Doherty amplifier 310 also has a control input coupled to the output of switching regulator 232. The additive effect of first Doherty output signal 220 and a second Doherty output signal 320 output by second Doherty amplifier 310, produces a total signal 322. Additional Doherty amplifiers may also be added in parallel, depending on the magnitude of the desired total signal 322.
  • FIG. 5 a flow chart representing a method, generally designated 400 of amplifying a signal, is illustrated.
  • Method 400 starts at block 62 where amplifier circuit 200 receives an input signal 250 at input 201.
  • input signal 250 is attenuated by variable attenuator 202, forming an attenuated signal.
  • the attenuated signal is amplified by driver amplifier 204, providing an input signal 206 to a first Doherty amplifier 208.
  • first Doherty amplifier 208 generates a first Doherty output signal 220 in response to receiving a supply voltage at control input 234.
  • first Doherty output signal 220 is detected by detector 224, which generates a detected output signal 226, at block 70.
  • Detected output signal 226 is compared to a threshold voltage by controller 228, at block 72. If the voltage of detected output signal 226 is below the threshold voltage, controller 228 generates a first control signal 230 and a second control signal 231 at block 74. If the voltage of detected output signal 226 is above the threshold voltage, controller 228 will not generate a first and second control signal.
  • switching regulator 232 upon receiving first control signal 230, switching regulator 232 generates an output which appears as a supply voltage at control input 234 of first Doherty amplifier 208. The supply voltage is proportional to first control signal 230.
  • first Doherty output signal 220 is modified at block 80.
  • variable attenuator 202 attenuates input signal 250 at block 82.
  • the voltage across the sum of variable attenuator 202 and amplifier 204 is modified.
  • a third embodiment depicted in FIG. 6 allows further amplifier circuit enhancement by replacing amplifier 204 with a Doherty amplifier 404.
  • An amplifier circuit 500 is configured with an input 403 and an output 240.
  • Amplifier circuit includes a variable attenuator 202, a first Doherty amplifier 404, a second Doherty amplifier 408, a detector 224, a controller 228, and a switching regulator 232.
  • An input signal 250 e.g. a multicarrier 900 megahertz (Mhz) RF signal which may be generated by a plurality of RF transceivers
  • Mhz multicarrier 900 megahertz
  • first Doherty amplifier 404 receives input signal 250 at input 403 and generates a first Doherty output signal 406 based upon a first supply voltage from switching regulator 232 provided to a first Doherty control input 233.
  • Second Doherty amplifier 408 receives first Doherty output signal 406 and generates a second Doherty output signal 220, based upon a second supply voltage from switching regulator 232 received at a second Doherty control input 234.
  • detector 224 preferably a diode detector, is coupled to the output of second Doherty amplifier 408 by means of a directional coupler (not shown).
  • Detector 224 samples and rectifies second Doherty output signal 220, and provides a detected output signal 226 to controller 228.
  • Detected output signal 226 is a direct current (DC) voltage proportional to the signal detected at a detector input 222.
  • controller 228 If detected output signal 226 is above a predetermined controller threshold, for example a threshold voltage, controller 228 does not generate a control signal. If detected output signal 226 falls below the threshold voltage, controller 228 will convert detected output signal 226 to a first control signal 230 suitable for input to switching regulator 232. The conversion is such that switching regulator 232 will decrease the supply voltage provided at second Doherty control input 234. As a consequence, the voltage gain of second Doherty amplifier 408 decreases in response to a decrease in detected output signal 226.
  • a predetermined controller threshold for example a threshold voltage
  • switching regulator 232 will increase the supply voltage provided at first Doherty control input 233.
  • the voltage gain of first Doherty amplifier 404 increases, in response to a decrease in detected output signal 226.
  • the voltage gain increase across first Doherty amplifier 404 coupled with the voltage loss across second Doherty amplifier 408 results in a substantially constant voltage across amplifier circuit 500 which maintains second Doherty amplifier 408 operation near it's saturation point.
  • a third Doherty amplifier 510 may be added in a parallel arrangement with second Doherty amplifier 408 such that third Doherty amplifier 510 has an input coupled to the input of second Doherty amplifier 408 and an output coupled the output of second Doherty amplifier 408, as illustrated.
  • Third Doherty amplifier 510 receives first Doherty output signal 406 and generates a third Doherty output signal 520, based upon the second supply voltage from switching regulator 232 received at third Doherty control input 234. The additive effect of second Doherty output signal 220 and third Doherty output signal 520, produces a total signal 322. Additional Doherty amplifiers may be added in parallel, depending on the magnitude of the desired total signal 322.
  • FIG. 8 a flow chart representing a method, generally designated 700 of amplifying a signal, is illustrated.
  • Method 700 starts at block 87 where amplifier circuit 500 receives an input signal 250 at input 403.
  • first Doherty amplifier 404 generates a first Doherty output signal 406 in response to receiving a first Doherty control input 233.
  • First Doherty control input 233 represents a supply voltage from switching regulator 232.
  • second Doherty amplifier 408 generates a second Doherty output signal 220 in response to receiving first Doherty output signal 406 and a second Doherty control input 234.
  • second Doherty output signal 220 is detected by detector 224, which generates a detected output signal 226.
  • Detected output signal 226 is compared to a threshold voltage by controller 228, at block 91. If the voltage of detected output signal 226 is below the threshold voltage, controller 228 generates a control signal 230 at block 92. If the voltage of detected output signal 226 is above the threshold voltage, controller 228 will not generate a control signal 230.
  • switching regulator 232 upon receiving control signal 230, switching regulator 232 generates an output which appears as a first supply voltage at first Doherty control input 233. In response to first Doherty control input 233, first Doherty output signal 406 is modified at block 94.
  • switching regulator 232 upon receiving control signal 230, switching regulator 232 generates an output which appears as a second supply voltage at second Doherty control input 234.
  • second Doherty output signal 420 is modified at block 96.
  • the modification to first and second Doherty output signals substantially maintain amplifier circuit 500 gain at a constant level with minimum distortion to the Doherty output signals.
  • Doherty amplifier operation occurs near maximum efficiency.

Claims (23)

  1. Circuit d'amplificateur comprenant :
    un amplificateur (204) qui comporte une entrée et une sortie ;
    un premier amplificateur de Doherty (208) qui comporte une entrée qui est couplée à ladite sortie dudit amplificateur, une sortie et une entrée de commande (234) ;
    un détecteur (224) qui comporte une entrée de détecteur qui est couplée pour détecter un premier signal de sortie de Doherty de ladite sortie dudit premier amplificateur de Doherty (208) et une sortie ;
    un contrôleur (228) qui comporte une entrée qui est couplée à ladite sortie dudit détecteur et une première sortie et une seconde sortie ;
    un régulateur de commutation (232) qui comporte une entrée qui est couplée à ladite première sortie dudit contrôleur et une sortie qui est couplée à ladite entrée de commande dudit premier amplificateur de Doherty (208) ; et
    un atténuateur variable (202) qui comporte une entrée de signal, une sortie qui est couplée à ladite entrée dudit amplificateur (204) et une entrée de commande qui est couplée à ladite seconde sortie dudit contrôleur (228).
  2. Circuit d'amplificateur selon la revendication 1, dans lequel un premier gain dudit circuit d'amplificateur comprend une tension aux bornes dudit premier amplificateur de Doherty (208).
  3. Circuit d'amplificateur selon la revendication 1, dans lequel un second gain dudit circuit d'amplificateur comprend une tension aux bornes d'une somme dudit atténuateur variable (202) et dudit amplificateur (204).
  4. Circuit d'amplificateur selon les revendications 2 et 3, dans lequel une somme dudit premier gain et dudit second gain est sensiblement constante.
  5. Circuit d'amplificateur selon la revendication 1, comprenant en outre un second amplificateur de Doherty (310 ; 314) qui comporte une entrée qui est couplée à ladite entrée dudit premier amplificateur de Doherty (208), une sortie qui est couplée à ladite sortie dudit premier amplificateur de Doherty et une entrée de commande qui est couplée à ladite sortie dudit régulateur de commutation (232).
  6. Circuit d'amplificateur selon la revendication 1, dans lequel les amplificateurs comprennent un dispositif à semiconducteur à transistor radio fréquence.
  7. Procédé d'amplification d'un signal d'entrée, le procédé d'amplification comprenant les étapes de :
    réception dudit signal d'entrée au niveau d'une entrée de signal d'un atténuateur variable (202) ;
    atténuation dudit signal d'entrée en formant un signal atténué (203) ;
    amplification dudit signal atténué en formant un signal amplifié (206) ;
    amplification dudit signal amplifié dans un premier amplificateur de Doherty (208) en formant un premier signal de sortie de Doherty (220) ;
    détection d'un signal total dans un détecteur (224) en formant un signal de sortie détecté, ledit signal total comprenant au moins ledit premier signal de sortie de Doherty ;
    comparaison dudit signal de sortie détecté à un seuil de contrôleur prédéterminé dans un contrôleur (228) ;
    génération d'un premier signal de commande et d'un second signal de commande dans ledit contrôleur si un signal de sortie détecté chute au-dessous dudit seuil de contrôleur prédéterminé ;
    génération d'une tension de sortie de régulateur de commutation dans un régulateur de commutation (232) sur la base dudit premier signal de commande ;
    modification d'une tension dudit premier amplificateur de Doherty (208) sur la base de ladite tension de sortie de régulateur de commutation ; et
    modification d'une tension dudit atténuateur variable sur la base dudit second signal de commande.
  8. Procédé selon la revendication 7, dans lequel un premier gain dudit circuit d'amplificateur comprend ladite modification de tension aux bornes dudit premier amplificateur de Doherty (208).
  9. Procédé selon la revendication 7, dans lequel un second gain dudit circuit d'amplificateur comprend une somme de ladite modification de tension dudit atténuateur variable (202) et dudit amplificateur.
  10. Circuit d'amplificateur selon les revendications 8 et 9, dans lequel une somme dudit premier gain et dudit second gain est sensiblement constante.
  11. Procédé selon la revendication 7, comprenant en outre les étapes de :
    amplification dudit signal amplifié dans un second amplificateur de Doherty (310 ; 314) en formant un second signal de sortie de Doherty ; et
    combinaison desdits premier et second signaux de sortie de Doherty en formant ledit signal total.
  12. Circuit d'amplificateur comprenant :
    un premier amplificateur de Doherty (404) qui comporte une entrée, une première entrée de commande de Doherty et une sortie ;
    un second amplificateur de Doherty (408) qui comporte une entrée qui est couplée à ladite sortie dudit premier amplificateur de Doherty, une sortie et une seconde entrée de commande de Doherty ;
    un détecteur (224) qui comporte une entrée de détecteur qui est couplée pour détecter un second signal de sortie de Doherty de ladite sortie dudit second amplificateur de Doherty et une sortie ;
    un contrôleur (228) qui comporte une entrée qui est couplée à ladite sortie dudit détecteur et une sortie ; et
    un régulateur de commutation (232) qui comporte une entrée qui est couplée à ladite sortie dudit contrôleur et des première et seconde sorties de régulateur de commutation, la première sortie de régulateur de commutation étant couplée à ladite première entrée de commande de Doherty et la seconde sortie de régulateur de commutation étant couplée à ladite seconde entrée de commande de Doherty.
  13. Circuit d'amplificateur selon la revendication 12, dans lequel un premier gain dudit circuit d'amplificateur comprend une tension aux bornes dudit second amplificateur de Doherty (408).
  14. Circuit d'amplificateur selon la revendication 12, dans lequel un second gain dudit circuit d'amplificateur comprend une tension aux bornes dudit premier amplificateur de Doherty (404).
  15. Circuit d'amplificateur selon les revendications 13 et 14, dans lequel une somme dudit premier gain et dudit second gain est sensiblement constante.
  16. Circuit d'amplificateur selon la revendication 12, comprenant un troisième amplificateur de Doherty (510 ; 514) qui comporte une entrée qui est couplée à ladite entrée dudit second amplificateur de Doherty (408), une sortie qui est couplée à ladite sortie dudit second amplificateur de Doherty et une entrée de commande qui est couplée à ladite seconde sortie de régulateur de commutation.
  17. Circuit d'amplificateur selon la revendication 12, dans lequel ledit amplificateur de Doherty comprend un dispositif à semiconducteur à transistor radio fréquence.
  18. Procédé d'amplification d'un signal d'entrée, le procédé d'amplification comprenant les étapes de :
    réception dudit signal d'entrée au niveau d'une entrée d'un premier amplificateur de Doherty (404) ;
    réception d'une première tension d'alimentation au niveau d'une première entrée de commande de Doherty dudit premier amplificateur de Doherty ;
    amplification dudit signal d'entrée (250) dans ledit premier amplificateur de Doherty en formant un premier signal de sortie de Doherty ;
    réception dudit premier signal de sortie de Doherty au niveau d'une entrée d'un second amplificateur de Doherty (408) ;
    réception d'une seconde tension d'alimentation au niveau d'une seconde entrée de commande de Doherty dudit second amplificateur de Doherty ;
    amplification dudit premier signal de sortie de Doherty dans ledit second amplificateur de Doherty en formant un second signal de sortie de Doherty ;
    détection d'un signal total en formant un signal de sortie détecté (226), ledit signal total comprenant au moins ledit second signal de sortie de Doherty ;
    comparaison dudit signal de sortie détecté à un seuil de contrôleur prédéterminé dans un contrôleur (228) ;
    génération d'un signal de commande dans ledit contrôleur si ledit signal de sortie détecté chute au-dessous dudit seuil de contrôleur prédéterminé ;
    génération d'une première tension d'alimentation dans un régulateur de commutation sur la base dudit signal de commande ;
    modification d'une tension dudit premier amplificateur de Doherty (404) sur la base de ladite première tension d'alimentation ;
    génération d'une seconde tension d'alimentation dans ledit régulateur de commutation sur la base dudit signal de commande ; et
    modification d'une tension dudit second amplificateur de Doherty (408) sur la base de ladite seconde tension d'alimentation.
  19. Procédé selon la revendication 18, dans lequel un premier gain dudit circuit d'amplificateur comprend ladite modification de tension dudit second amplificateur de Doherty (408).
  20. Procédé selon la revendication 18, dans lequel un second gain dudit circuit d'amplificateur comprend ladite modification de tension dudit premier amplificateur de Doherty (404).
  21. Circuit d'amplificateur selon les revendications 19 et 20, dans lequel une somme dudit premier gain et dudit second gain est sensiblement constante.
  22. Procédé selon la revendication 9, comprenant en outre les étapes de :
    amplification dudit premier signal de sortie de Doherty dans un troisième amplificateur de Doherty (510 ; 514) en formant un troisième signal de sortie de Doherty ; et
    combinaison dudit second signal de sortie de Doherty et dudit troisième signal de sortie de Doherty en formant ledit signal total.
  23. Procédé selon la revendication 18, dans lequel ledit seuil de contrôleur prédéterminé est sélectionné sur la base d'une puissance de signal d'entrée mesurée.
EP98921105A 1997-09-30 1998-05-08 Appareil et procede d'amplification d'un signal Expired - Lifetime EP1020026B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US940563 1997-09-30
US08/940,563 US5886575A (en) 1997-09-30 1997-09-30 Apparatus and method for amplifying a signal
PCT/US1998/009543 WO1999017443A1 (fr) 1997-09-30 1998-05-08 Appareil et procede d'amplification d'un signal

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EP1020026A1 EP1020026A1 (fr) 2000-07-19
EP1020026A4 EP1020026A4 (fr) 2001-04-04
EP1020026B1 true EP1020026B1 (fr) 2004-06-30

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EP (1) EP1020026B1 (fr)
JP (1) JP4088415B2 (fr)
KR (1) KR100329133B1 (fr)
BR (1) BR9812398A (fr)
DE (1) DE69824873T2 (fr)
WO (1) WO1999017443A1 (fr)

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EP1020026A1 (fr) 2000-07-19
JP2001518731A (ja) 2001-10-16
JP4088415B2 (ja) 2008-05-21
BR9812398A (pt) 2000-09-12
DE69824873D1 (de) 2004-08-05
EP1020026A4 (fr) 2001-04-04
WO1999017443A1 (fr) 1999-04-08
US5886575A (en) 1999-03-23
KR20010024337A (ko) 2001-03-26
DE69824873T2 (de) 2005-06-30
KR100329133B1 (ko) 2002-03-18

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